Hello to you all!

I never had this issue until a few days ago. I didn't press single button to activate that, and i don't know if server that i'm connected on is a problem ( i don't think it is because it was all good, im like 2-3 years here and it never happened).
I tried to reinstall TS3 and everything, but still same thing. Here is a video too. I hope you guys can help me and respond really fast. Video URL: https://youtu.be/JbVj64phKs0

Thanks for help!